Regenerative heat exchanger for



W. LINDER Feb. 18, 1941.

REGENERATIVE HEAT EXGHANGER FOR GASEOUS MEDIA 3 Sheets-Sheet 2 Filed May 5, 1938 Feb. 18, 1941. w. UNDER 2,232,121

REGENERATIVE HEAT EXCHANGER FOR GASEOUS MEDIA Filed May 5, 1938 3 Sheets-Sheet 3 k N S Patented Feb. 18, 1941 UNITED STATES PATENT OFFICE REGENERATIVE HEAT EXCHANGER FOR GASEOUS MEDIA Application May 5, 1938, Serial No. 206,124 In Germany May 5, 1937 2 Claims.

The present invention relates to regenerative heat exchangers, similar to the well-known stoves of the system Cowper, for preheating or coolingdown gaseous media, said heat exchangers being equipped with refractory checkerwork which is periodically supplied with heat.

The main object of my present invention is to improve the design of these tower-like heat exchangers in such a manner that gases may be withdrawn from or introduced into the heat exchangers at various temperatures.

The solution of this problem, according to .the present invention, consists in fitting the heat exchanger with one or several gas outlets and inlets which are arranged at a suit-able intermediate level of the checkerwork and in providing the checkerwork with horizontal cross channels at the level of the intermediate gas outlets and inlets in such a way that all the vertical gas con- 20 ducting channels or other spaces of the checkerwork are connected with the intermediate gas outlet and inlet, or with the individual intermediate gas outlets and inlets when more .than one is employed. Further the invention comprises 25 Ithe provision ,of an annular channel in the brick lining of the heater-jacket, in the zones of the gas outlets and inlets, said channel on the one hand being in connection with the vertical channels of the checkerwork through the horizontal cross-channels and on .the other hand with the gas discharge pipe-line.

With the above and other objects of my invention in view, I will now describe a preferred embodiment of my invention on the lines of the accompanying drawings, in which Figure 1 is a vertical section through a towerlike heat exchanger for preheating the gases ac cording to my present invention.

Figure 2 shows on an enlarged scale a horiline II-II of Figure 3.

Figure 3 finally shows on an enlarged scale a 55 or the like, mixed with steam in the appropriate zontal section through the heat-exchanger on proportion, through a regenerative heat exchanger designed similarly to a blast-furnace hot blast stove, the checkerwork of which, serving for the exchange of heat, has been previously heated up to the desired high temperature. The relatively 5 cold mixture consisting of steam and gas takes up .the heat from the hot checkerwork of the regenerator and is thus first heated-up to the temperature necessary for the conversion.

As soon as this temperature has been arrived 10 at, further heat is withdrawn by the gas from a further zone of the checkerwork in order .to eifect and maintain the endothermicreaction.

In consequence of this, considerably more heat is taken from the checkerwork in the zone of 15 higher temperature endothermic reaction .than in the zones situated near the inlet of the cold media. When the checkerwork is heated-up again, the temperature of the waste gases, upon leaving the known heat-exchangers, increases rapidly, after reversal of the regenerative heaters, and the greater part of the heating-up gases leaves .the heater at too high a temperature, as the zones of lower temperatures of the checkerwork absorb only a comparatively small quantity of the heat.

Since the temperature of the waste gases varies considerably and since, on the other hand, the temperature of the waste gases leaving the regenerator is relatively low the utilization for other purposes of .the sensible heat of the final spent waste heat gases of a heater, in which the conversion of gases containing methane, or other endothermic reactions are carried out, is rendered rather diflicult, if not at all practically impossible.

Now the above mentioned difficulty is overcome, according to my present invention, by equipping the heater with means which enable the withdrawal of a part of the hot gases, used for heating-up the checkerwork, in an adjustable quantity from a zone of a higher temperature of the heater, before this part of the hot waste gases goes through the checkerwork zones near the inlet for the relatively cold reaction media, thus by-passing the latter zones.

The heater, as illustrated on the drawings, consists of a casing l, preferably made of steel plate or another suitable material. The casing I is lined inside with a layer 2 of heat insulating ma- 60 terial and an inner layer 3 of refractory material. A reaction chamber 1 is formed by the refractory brickwork 3. The chamber 1 is covered on the top' by an arch 4. In the arch 4, there is an opening or port 5 which serves in al- Feb. 18, 1941. E. I. LXNDMAN 2 APPARATUS FOR DIVIDING SEMISOLID PLASTIC MATERIALS Filed Oct. 4, 1939 

